public class Heater
{
    private int temperature;

    /**
     *  Creates a new Heater with an initial temperature of 15.
     */
    public Heater()
    {
        temperature = 15;
    }

    /**
     * Increases the temperature by 5 degrees
     */
    public void warmer()
    {
        temperature += 5;
    }

    /**
     * Decreases the temperature by 5 degrees
     */
    public void cooler()
    {
        temperature -= 5;
    }

    /**
     * Gets the current temperature of the heater
     */
    public int getTemperature()
    {
        return temperature;
    }
}